Invasion
Invasion Description
1st Record: Whatcom County/WA/Samish Bay (1924, Kincaid 1947, cited by Carlton 1979)
Geographic Extent
Vancover Island/British Columbia/Barkley Sound (2006, Gillespie et al. 2007); Ladysmith, Vancover Island/British Columbia/Straits of Georgia (1934, Elsey 1934, cited by Carlton 1979); Comox, Vancover Island/British Columbia/Comox Habor, Straits of Georgia (Carl and Giguet 1958, cited by Carlton 1979); Sooke, Vancover Island/British Columbia/Straits of Juan de Fuca (Carl and Giguet 1972); British Columbia/Fraser River estuary (Environment Canada 1994); Crescent Beach/British Columbia/Boundary Bay (Houart and Sirenko 2003); Whatcom County/WA/Boundary Bay (1931, Sherwood 1931, cited by Carlton 1979); Whatcom County/WA/Bellingham Bay (1926, Dall 1926, cited by Carlton 1979); Whatcom County/WA/Samish Bay (1924, Kincaid 1947, cited by Carlton 1979); Taylor shellfish Farms/WA/Samish Bay (Williams and McDonald 2009); WA/Puget Sound (Galtsoff 1932, cited by Carlton 1979; Cohen et al. 1998); WA/Hood Canal, Puget Sound (1960, oyster beds, ANSP 243672, Academy of Natural Sciences of Philadelphia 2007); near Olympia/WA/Puget Sound (1962, MCZ MCZ 239571, Museum of Comparative Zoology 2007); Thurston County/WA/Mud Bay, Eld Inlet (Houart and Sirenko 2003); Shelton/WA/Oakland Inlet (Houart and Sirenko 2003)
Vectors
| Level | Vector |
|---|---|
| Probable | Oyster Accidental |
Regional Impacts
| Economic Impact | Fisheries | |
| Ocinebrellus inornatus is 'very destructive to native oysters in Puget Sound' (Galtsoff 1932). 'Considerable destruction of seed oysters' occurred in Ladysmith Harbour, British Columbia (Carl and Giguet 1972). However, O. inornatus prefers small individuals of the introduced Pacific Oyster (Crassostrea gigas) to juveniles of the native O. lurida (Olympia Oyster) (Buhle and Ruesink 2009; Grason and Miner 2012a). Permits (and presumably inspection and cleaning) are required for the movement of oysters and culture equipment between bays in Washington and British Columbia. Drill damage in an infested oysterbed can be controlled by tilling the ground, removing debris, and planting older oysters, less likely to be eaten. Drills can be buried by dragging dredges over the bottom. Coordination between growers on adjacent grounds is essential for control (Quayle 1969). | ||
| Ecological Impact | Predation | |
| The Japanese Oyster Drill's feeding rate on mussels is about 2X that of native Nucella lamellosa (Frilled Dogwinkle) and O. inornatus from Samish Bay (Wlliams and McDonald 2009). Ocinebrellusr inornatus is 'very destructive to native oysters in Puget Sound' (Galtsoff 1932). However, O. inornatus prefers small individuals of the introduced Pacific Oyster (Crassostrea gigas) to juvenile native O. lurida (Olympia Oyster) (Buhle and Ruesink 2009; Grason and Miner 2012a). The Red Rock Crab (Cancer productus) is a predator on Oyster Drills, both the Japanese O. inornata and the Atlantic Urosalpinx cinerea, and prefers juvenile drills to adults. However, the crabs prefer juvenile oysters (specifically C. gigas) to both species of snails, and so may contribute to oyster mortality, rather than reducing it (Grason and Miner 2012a). The two introduced snails both show behavioral responses, hiding and reduced feeding, in the presence of the native crabs (Grason and Miner 2012b). In experiments, Ocinebrellus inornatus was a more significant predator on Olympia oysters, than native rock crabs (Cancridae), and suffered little predation from the crabs (Grason and Buhle 2016). | ||